Im trying to make a scarf, knit and pearl. Should I always be starting and ending with the same stitch. Meanining if I start a row with a knit should it end with a knit, and the next row start with a knit and end with a knit.

It depends how many sts you have and if you're trying to get ribbing (columns of knit and purl sts alternating) or seed stitch which is a bumpy textured stitch. Look on the Tips page under Basic stitches to see ribbing and seed stitch.

It depends how many sts you have and if you're trying to get ribbing (columns of knit and purl sts alternating) or seed stitch which is a bumpy textured stitch. Look on the Tips page under Basic stitches to see ribbing and seed stitch.

To elaborate on this point (because I'm bored and taking a break from knitting a fingering sock weight scarf) here's an example, lets say you're doing a 2x2 rib (K2, p2) scarf. You cast on 32 sts, that would mean your 1st row would be ending with P2 assuming you had started the row with K2, so when you start the 2nd row it would start with K2. Now if you had cast on 34 sts (again starting with K2), your 1st row would end with K2, the 2nd row would start with P2 instead of K2. As you can see (I hope) the number of cast on sts changes how you begin the next row. The pattern also changes which stitch you would make as well.